global class EmailVelocityCheckScheduler
{
 global void EmailVelocityCheckScheduler() {}
 
 // window is in mins
 public static void start(Integer start, Integer window, Integer thresh)
 {
     List<String> ick = new List<String> {String.valueOf(start)};
     //Seconds Minutes Hours Day_of_month Month Day_of_week optional_year
     String cron = String.format('0 {0} * * * ?', ick);
     System.debug(cron);
     System.schedule('Email Velocity Check', cron, new CalcEmailVelocity(start, window, thresh));
 }
}